2003-2009 Nissan 350Z

2003 350z upstream o2 not making up to ecu

Old 07-07-2019, 10:28 AM
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Default 2003 350z upstream o2 not making up to ecu

Hello I have a 2003 350z Base - Manual - The issue is with the Upstream O2 sensor not making signal to ECU. The ECU shows good and believe it is wiring from sensor to the ecm. Does anyone have a schematic to the pin from the upstream o2 to the ecm? Hope this makes sense. My daughter is waiting to get mechanic to trace but he is busy and wanted to help on my end as this forum sees a lot of smart people. It does show code the Heat is not working on the sensor. Hope someone can figure this out. Thank you
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Old 07-07-2019, 02:52 PM
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I recommend you download the 2003 Service Manual from Specifically, you want the ec.pdf file. In it you will find descriptions of all the trouble codes as well as schematics and diagnostic procedures. And remember, there are 2 upstream O2 sensors, one for each cylinder bank.
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Old 07-07-2019, 10:57 PM
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Dont quote me as I'm going off documentation from my aftermarket ECU (your best bet will be to check the FSM) but heres my pin-outs for the O2s

Right Front Heated O2 Sensor - Aux Input #6 (ECU Pin #24)
Left Front Heated O2 Sensor - Aux Input #7 (ECU Pin #2)

Right Rear O2 Sensor - Analog Volt #10 (ECU Pin #35)
Left Rear O2 Sensor - Analog Volt #11 (ECU Pin #16)
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